I'm so rooting for my Swiss cheese plant to grow its classic split leaves.
Hopefully all this sun helps it to mature faster and deliver, the delicious monster.
All puns intended — apologies. *hides*pic.twitter.com/hkngu8Jvud
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Yip sigh
It's possible, in certain cases, to save them. And you will learn something from trying at least even if they still die. The first step is to unpot them and cut off all the rotting parts.
Google your specific plant to find out what repotting soil it needs and what root rot looks like for them, cut off the rot as best you can, and repot them in new soil. Make sure your new soil is safe by buying new ingredients and mixing or pre-mixed obv.
Usually repotting means watering but obviously in this case do not water them for at least a few days. Check back on them often and see if they are recovering. Good luck!
What species are your plants? 
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